- 两份水样pH值的测定结果分别为 4.0 和 7.0 ，这两份水样的氢离子活度相差（）倍。
- 测定80.0ml水样的DO，消耗0.010mol/L的Na2S2O314.24ml，该水样的DO(O2，mg/L)为（）。
- 用重铬酸钾法测定水样的COD时，所用催化剂为（）。
- 对河流污染的监测，布设在进入城市、工业排污区的上游、不受该污染区域影响地点的断面称为（）。
- （）的大小是衡量准确度高低的尺度。
- 水中氨氮是指以 （）或（）形式存在的氮。
- 我国环境标准中的“三级”指（）、（）、（）；
- The advertisement for the security guard position says that applicants must be able to remain ----- for six hours straight.
- Ms. Hartfield will make an excellent executive because, when confronted with a problem, she knows ----- what course of action to take.
- An investigation by the committee uncovered ----- instances in which the institution ’s resources had been misused.
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